Therefore allowing me to create an accurate test and allowing me to obtain precise results. My experiment was carried out very safely. This problem would have been avoided if I used more accurate equipment.
Below are diagrams to illustrate and explain my method Fair Test To ensure that this experiment is fair I will control the variables, i. The independent variables will be the initial volume and concentration of sodium thiosulphate, and the initial volume and concentration of hydrochloric acid.
Taken as a whole I can see that my experiment went very well. I am very confident with my results and I can feel that my investigation was very precise, accurate and my results were extremely reliable. Variables There are different variables which can be changed. I Chemistry coursework sodium thiosulphate concentration that I would find a wrong result whilst doing my experiment, however my prediction was wrong and the results were very accurate.
Nevertheless I measured the time taken to the nearest second which builds precision in my experiment.
What my graph shows is that the percentage of sodium-thiosulphate increased then the time taken for the experiment decreased. I could have also changed the concentration of the HCL solution.
Interpreting Data What I notice in my results was that as the concentration of STS kept on increasing the time take for the solution to get cloudy was decreasing. Not only is the results reliable but they are easy to understand as for the key which describes the part on the graph such as line of best fit, error bars etc.
This means more of the particles collide and more of the collisions result in a reaction, so the rate of reaction increases.
In addition to this, more particles have activation energy. I kept the other variables the same in order to allow my experiment to be a fair test. I made sure that I was wearing my safety goggles whilst I carried out my test. I repeated these volumes three times and as a result no outliers had become visible to me on my data.
The picture bellow suggests that if the concentration increases the collision rate increases. Strategy According to my results, as the concentration of STS solution increased the rate of reaction of my experiment was increased.
This is because as the temperature increases, the reactant particles move more quickly. Similarly my real experiment was done very precisely such as calculating or measuring the results or measuring the amount of solution in each beaker etc.
I realised that picking the 1 molar STS solution the rate of reaction was very slow. Results Below is a table showing my results from the main investigation I can see from observing the table that the first part of my prediction was correct.
I also had to choose which type concentration I needed either 1 molar or 2 molars concentration types. This might have occurred for several different reasons, such as the fact that the temperature control might not have been exactly the same or that my judgement of when the cross may have disappeared might not have been exactly the same for each one.
This would make my investigation more of a fair test because during my experiment I used a stronger concentration of the STS solution and so it would have been better if I used the stronger HCL solution.Rates of Reaction - Sodium Thiosulphate and Hydrochloric acid In this piece of coursework, I will study how concentration affects the rate of reaction.
I will do so by timing the reaction of Sodium Thiosulphate with an acid. GCSE Chemistry - Sodium Thiosulphate Coursework The concentration of hydrochloric acid The concentration of sodium thiosulphate The amount of hydrochloric acid The amount of sodium thiosulphate The temperature The surface area of the reactants The size and colour of the cross The size of the conical flask To keep this.
How concentration affects the rate of reaction between Hydrochloric Acid and Sodium Thiosulphate Chemistry Coursework How Concentration Affects a Reaction Aim: The aim of this experiment is to find out how concentration affects the rate of reaction between Hydrochloric Acid and Sodium Thiosulphate.
- Sodium Thiosulphate's Effect on the Rate of Reaction with Hydrochloric Acid Aim: I am going to investigate how varying the concentration of Sodium Thiosulphate affects the rate of reaction with Hydrochloric Acid.
sodium thiosulphate solution and dilute hydrochloric acid.
These react according to the equations below: sodium thiosulphate + hydrochloric acid sodium chloride + water + sulphur dioxide + sulphur Na2S2O3(aq) + 2HCl(aq) 2NaCl(aq) + H2O(l) + SO2(g) + S(s) Your teacher will demonstrate a simple way to measure the rate of this reaction.
Investigating how the concentration of sodium-thiosulphate (STS) and hydrochloric acid (HCL) affects the rate of reaction in the experiment. In addition I am also checking how different variables affect my experiment and also how I can make my test more precise, reliable and accurate.Download